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Added to the Dr.Web virus database: 2011-04-26

Virus description added:

An encryption ransomware written in Delphi. First versions of this Trojan were discovered in April, 2011. Since then, new modifications of the program have been emerging with persistent regularity. The Trojan encrypts the user’s files using the RSA cipher, which makes decryption without the private key rather difficult. Moreover, due to the fact that the Trojan’s code contains a 32-bit variable, the malware adds its data to the beginning of the files larger than 4 GB. This results in these files being damaged and impossible to recover. The Trojan also adds several blocks of “garbage data” with a step of 0x400 bytes to the files.


The program saves the decryption information as a hexadecimal data block at the end of the files.


Usually, this Trojan does not modify file names. The message containing the ransom demand is displayed on the Windows Desktop. Cybercriminals can use the following email addresses:,,,,,,

Without the key, a partial decryption of the files affected by the actions of this malware is possible.

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

Find out more about Dr.Web for Android